*{
    margin: 0;
    padding: 0;
}

.box{
    width: 800px;
    height: 800px;
    margin: 50px auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.yinyang{
    width: 600px;
    height: 600px;
    background: #fff;
    box-sizing: border-box;
    border-color: #000;
    border-style: solid;
    border-width: 10px 10px 300px 10px;
    border-radius: 100%;
    position: absolute;
    z-index: 10;
    transform: scale(0.7);
    animation: yinyangRotate 10s infinite linear;
}

.yinyang::before{
    content: "";
    width: 290px;
    height: 290px;
    background: #fff;
    box-sizing: border-box;
    border-radius: 100%;
    border: 110px solid #000;
    position: absolute;
    left: 0;
    top: 100%;
    transform: translate(0, -50%);
}

.yinyang::after{
    content: "";
    width: 290px;
    height: 290px;
    background: #000;
    box-sizing: border-box;
    border-radius: 100%;
    border: 110px solid #fff;
    position: absolute;
    right: 0;
    top: 100%;
    transform: translate(0, -50%);
}

@keyframes yinyangRotate {
    from{
        transform: scale(0.7) rotate(0deg);
    }

    to{
        transform: scale(0.7) rotate(360deg);
    }
}

.bg-black{
    width: 600px;
    height: 200px;
    background: #000;
    position: relative;
}

.bg-black::before{
    content: "";
    width: 220px;
    border-left: 190px solid transparent;
    border-right: 190px solid transparent;
    border-bottom: 200px solid #000;
    position: absolute;
    left: 0;
    top: -200px;
} 

.bg-black::after{
    content: "";
    width: 220px;
    border-left: 190px solid transparent;
    border-right: 190px solid transparent;
    border-top: 200px solid #000;
    position: absolute;
    left: 0;
    bottom: -200px;
}

.bg-white{
    width: 570px;
    height: 190px;
    background: #fff;
    position: absolute;
}

.bg-white::before{
    content: "";
    width: 210px;
    border-left: 180px solid transparent;
    border-right: 180px solid transparent;
    border-bottom: 190px solid #fff;
    position: absolute;
    left: 0;
    top: -190px;
} 

.bg-white::after{
    content: "";
    width: 210px;
    border-left: 180px solid transparent;
    border-right: 180px solid transparent;
    border-top: 190px solid #fff;
    position: absolute;
    left: 0;
    bottom: -190px;
}

.side{
    width: 100px;
    height: 100px;
    position: absolute;
    z-index: 9;
}

.side:nth-child(1){
    transform: rotate(0deg) translateY(-280px);
}

.side:nth-child(2){
    transform: rotate(45deg) translateY(-270px);
}

.side:nth-child(3){
    transform: rotate(90deg) translateY(-280px);
}

.side:nth-child(4){
    transform: rotate(135deg) translateY(-270px);
}

.side:nth-child(5){
    transform: rotate(180deg) translateY(-280px);
}

.side:nth-child(6){
    transform: rotate(225deg) translateY(-270px);
}

.side:nth-child(7){
    transform: rotate(270deg) translateY(-280px);
}

.side:nth-child(8){
    transform: rotate(315deg) translateY(-270px);
}

.line{
    width: 90px;
    box-sizing: border-box;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 10px solid #000;
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translate(-50%, 0);
}

.line:nth-child(1){
    width: 50px;
    bottom: 0;
}

.line:nth-child(2){
    width: 70px;
    bottom: 15px;
}

.line:nth-child(3){
    width: 90px;
    bottom: 30px;
}

.split-line::before{
    content: "";
    width: 8px;
    height: 12px;
    display: block;
    background: #fff;
    position: absolute;
    left: 50%;
    margin-left: -4px;
    top: -12px;
}